One.To prevent the spread of virus inside the firmware, which often can bring about harm to the ANTMINER S19 collection, the placing operate of “Secure Boot” has been switched on as well as “Root Authority” operate is disabled. In the event you have not acquired your refund still, please Check https://bitmain-antminer-s963949.blogofchange.com/35193523/examine-this-report-on-bitmain-antminer